Invalid Text_extraction

[pubpub-zz]

Environment

Which environment were you using when you encountered the problem?

Python 3.10 - Windows ; PyPDF 2.10.4

Code + PDF

import PyPDF2;p=PyPDF2.PdfReader("c:/main.pdf");p.pages[0].extract_text()

main.pdf

Traceback

reports:
'/a68/a105/a115/a112 /a101/a110/a115/a101 /a100/a105 /a97/a108/a103/a111/a114/a105/a116/a109/a105 /a101 /a115/a116/a114/a117/a116/a116/a117/a114/a101 /a100/a97/a116/a105\n/a76/a101/a111/a110/a97/a114/a100/a111 /a68/a101 /a70 /a97 /a118 /a101/a114/a105\n/a65/a46/a65/a46 /a50/a48/a50/a49/a47/a50/a48/a50/a50'

instead of
'Dispense di algoritmi e strutture dati
Leonardo De Faveri
A.A. 2021/2022'

[pubpub-zz]

The fonts include a /Differences section:
[46, '/a46', '/a47', '/a48', '/a49', '/a50', 51, '/.notdef', 65, '/a65', 66, '/.notdef', 68, '/a68', 69, '/.notdef', 70, '/a70', 71, '/.notdef', 76, '/a76', 77, '/.notdef', 97, '/a97', 98, '/.notdef', 100, '/a100', '/a101', 102, '/.notdef', 105, '/a105', 106, '/.notdef', 110, '/a110', '/a111', 112, '/.notdef', 114, '/a114', 115, '/.notdef', 118, '/a118']

they are using name characters and ascii codes.